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What is optical passive device CCWDM?

CCWDM is Compact CWDM (compact coarse wavelength division multiplexing), which is a wavelength division multiplexing technology based on TFF (thin film filter). It works in the same way as the CWDM module, the difference is that CCWDM uses free space technology (As shown in Figure 1), compared with the common CWDM optical fiber cascading method (as shown in Figure 2), the CCWDM package size is greatly reduced compared with the CWDM module, and the insertion loss is lower and the consistency is better; it can replace CWDM Products are used in telecommunications, enterprise networks, PON networks, cable TV and other fields. The lower insertion loss makes the CCWDM module have lower signal attenuation during operation, thereby reducing the power requirement for the signal transmitter.

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MUX and DEMUX

The basic idea of a Mux device is to integrate multiple signals into a bundle, and this bundle of signals is transmitted and processed in the model as a whole. Paired with Mux is Demux, which separates the signals from each other so that each signal can be processed separately.

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fiber optic coupler

A fiber optic coupler is a fiber optic connection device that uses the refraction properties of light in a waveguide to convert the optical signal at the input end into an optical signal available at the output end.

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2022

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EDFA equalization technology - GFF introduction

EDFA is the core functional device in the optical transmission system, which has the advantages of high gain, large bandwidth, low noise, gain characteristics insensitive to optical polarization state, transparent to data rate and format, and negligible channel crosstalk in multi-channel systems. . The combination of DWDM and EDFA can not only increase the capacity of the system, but also has high flexibility and economy. However, due to the dense multiplexing of channel wavelengths and the uniform broadening characteristics of EDFA, there is fierce competition between different channels, and the gain and spectral line shape of EDFA need to be kept stable, so the problem of EDFA gain control and flatness is introduced. At present, there are mainly technical means to achieve EDFA gain flatness, such as thin-film filtering, low-light sinusoidal filtering, and fiber grating filtering. Optical gain flattening filter GFF is based on mature thin-film filtering technology, which is used in EDFA to compensate the uneven gain amplification under different DWDM channels. Figure 1 shows the working principle of the GFF diaphragm.

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orte communication inaugural football match

On the afternoon of September 29, 2022, in such a season full of harvest, with the whistle of the referee, Orte Communication's first football match kicked off in the company's football stadium.

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2022

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Introduction to Coarse Wavelength Division Multiplexer Application

In principle, it is to use an optical multiplexer to multiplex optical signals of different wavelengths into a single optical fiber for transmission, and at the receiving end of the link, use an optical demultiplexer to decompose the mixed signals in the optical fiber into signals of different wavelengths , connect to the corresponding receiving device.

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2022

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Affecting the performance index of WDM wavelength division multiplexer

The working band of WDM devices, such as 1550 wavelength, distinguishes three bands: S-band (short-wavelength band 1460-1528nm), C-band (conventional band 1530-1565nm), L-band (long-wavelength band 1565-1625nm).

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